Trendwoo Bluetooth Earphones with Microphone, Bluetooth 4.0 Sport Earbuds for Running, Wireless Sport Earbuds Stereo - Blue Bluetooth earphones with microphone: Bluetooth capability allows you to connect wireless up to 33 feet with any bluetooth compatible enabled devices for music/audio streaming and to answer phone calls with built-in microphone Sport earbuds: Magnet Attraction, portable, user-friendly and advanced Magnet Attraction design, let the headphones hang like a necklace, very easy to store into your clothing or bag, not easy to fall off Wireless sport earbuds: Comfortable earbuds are ergonomic designed, included 3 pairs of silicone ear gels conforms to the shapes of your ears, can be adapted to different groups of people CVC 6.0 Digital noise reduction technology, intelligently filter ambient noise, enable clearer sound during calls and while listening to music Built in rechargable lithium battery, about 6 hours talking,4 hours playing time,2 hours charging time, 200 hours standby when full charge, so you have less time charging and more time using